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RX24U Datasheet, PDF (87/131 Pages) Renesas Technology Corp – 32-bit RXv2 CPU core
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RX24U Group
5. Electrical Characteristics
Table 5.16 Clock Timing
Conditions: VCC = 2.7 V to 5.5 V, AVCC0 = AVCC1 = AVCC2 = VREFH0 = VREFH1 = VREFH2 = VCC to 5.5 V,
VSS = AVSS0 = AVSS1 = AVSS2 = VREFL0 = VREFL1 = VREFL2 = 0 V, Ta = –40 to +85°C
Item
Symbol
Min.
Typ.
Max.
Unit
Test Conditions
EXTAL external clock input cycle time
tXcyc
50
—
—
ns
Figure 5.20
EXTAL external clock input high pulse width
tXH
20
—
—
ns
EXTAL external clock input low pulse width
tXL
20
—
—
ns
EXTAL external clock rise time
tXr
—
—
5
ns
EXTAL external clock fall time
tXf
—
—
5
ns
EXTAL external clock input wait time*1
tXWT
0.5
—
—
μs
Main clock oscillator oscillation frequency
fMAIN
1
—
20
MHz
Main clock oscillation stabilization time (crystal)*2
tMAINOSC
—
3
—
ms Figure 5.21
Main clock oscillation stabilization time (ceramic
tMAINOSC
—
50
—
μs
resonator)*2
LOCO clock oscillation frequency
LOCO clock oscillation stabilization time
HOCO clock oscillation frequency
HOCO clock oscillation stabilization time
fLOCO
3.44
4.0
4.56
MHz
tLOCO
—
—
0.5
μs
Figure 5.22
fHOCO
31.52
32
32.48
MHz Ta = –40 to –20°C
(32 MHz) 31.68
32
32.32
MHz Ta = –20 to +75°C
31.52
32
32.48
MHz Ta = +75 to +85°C
fHOCO
63.04
64
64.96
MHz Ta = –40 to –20°C
(64 MHz) 63.36
64
64.64
MHz Ta = –20 to +75°C
63.04
64
64.96
MHz Ta = +75 to +85°C
tHOCO
—
(32 MHz)
—
37.1
μs
Figure 5.24
tHOCO
—
(64 MHz)
—
80.6
μs
Figure 5.24
IWDT-dedicated clock oscillation frequency
fILOCO
12.75
15
17.25
kHz
IWDT-dedicated clock oscillation stabilization time
tILOCO
—
—
50
μs
Figure 5.25
PLL circuit oscillation frequency
fPLL
40
—
80
MHz
PLL clock oscillation stabilization time
tPLL
—
—
50
μs
Figure 5.26
PLL free-running oscillation frequency
fPLLFR
—
8
—
MHz
Note 1. Time until the clock can be used after the main clock oscillator stop bit (MOSCCR.MOSTP) is set to 0 (operating) when the
external clock is stable.
Note 2. Reference values when an 8 MHz resonator is used.
When specifying the main clock oscillator stabilization time, set the MOSCWTCR register with a stabilization time value that is
equal to or greater than the resonator-manufacturer-recommended value.
After changing the setting of the MOSCCR.MOSTP bit so that the main clock oscillator operates, read the OSCOVFSR.MOOVF
flag to confirm that is has become 1, and then start using the main clock.
EXTAL external clock input
tXr
Figure 5.20 EXTAL External Clock Input Timing
R01DS0278EJ0100 Rev.1.00
Mar 31, 2017
tXcyc
tXH
tXL
tXf
VCC × 0.5
Page 87 of 131
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